Hexavalent-chromium wastewater treatment technology
A wastewater treatment and hexavalent chromium technology, which is applied in the field of hexavalent chromium wastewater treatment process, can solve the problems of troublesome operation and high treatment cost, and achieve the effects of low equipment investment and operation cost, simple operation and improved economic benefits
Inactive Publication Date: 2016-08-17
CANGZHOU HONGHAI CHEM CO LTD
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[0003] The invention provides a hexavalent chromium wastewater treatment process to
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The invention discloses a hexavalent-chromium wastewater treatment technology. The hexavalent-chromium wastewater treatment technology includes the steps that hexavalent chromium in wastewater is reduced to trivalent chromic ions through sodium hydrogen sulfite with the oxidation-reduction method, the PH value is adjusted, and trivalent chromium forms chromic hydroxide to be removed in a precipitation method accordingly. Compared with other treatment methods, the method is low in device investment and operating cost, easy to operate and suitable for hexavalent-chromium wastewater treatment of the electroplating industry, the printing and dyeing industry, the pharmaceutical industry, the light and textile industry, the chemical industry and the like, wastewater is sustainably treated on the spot, and pollution of the industry to the environment is reduced; meanwhile, the economic benefits of enterprises are increased, and the win-win effect is achieved.
Description
technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a hexavalent chromium wastewater treatment process. Background technique [0002] At present, the chromium-containing wastewater mainly comes from the metal electroplating industry, and metal processing enterprises such as the steel manufacturing industry and the domestic metallurgical and chemical industries discharge about 200,000 to 300,000 tons of chromium slag every year. The harmful components in chromium slag are mainly hexavalent chromium ions such as soluble sodium chromate and acid-soluble calcium chromate. Because of these hexavalent chromium and its loss and diffusion, it constitutes a pollution hazard to the ecological environment. The second is the strong alkali hazard of chromium slag. When chromium slag is piled up in the open air, a large amount of hexavalent chromium ions dissolve, lose, and infiltrate into the surface with rainwater after long-te...
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Login to view more IPC IPC(8): C02F9/04C02F101/22
CPCC02F9/00C02F1/00C02F1/56C02F1/66C02F1/70C02F2101/22C02F2301/08
Inventor 马海青李晨周敬伟
Owner CANGZHOU HONGHAI CHEM CO LTD
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